Stool base



FIG. 1 is a perspective view of a stool base showing the new design, the broken lines at the top indicating a form of seat being for illustrative purposes only;

FIG. 2 is a front elevational view; the rear being similar and predictable;

FIG. 3 is a side elevational view taken at approximately 90 degrees from the front elevational view of FIG. 2;

FIG. 4 is a bottom plan view; and,

FIG. 5 is a top plan view. 

The ornamental design for a stool base, as shown and described. 